code: def test_add_noise_cov(
      input_tensor: TensorType,
      variance: TensorType,
      expected_tensor: TensorType,
  ) -> None:
      actual_tensor = add_noise_cov(input_tensor, variance)
      np.testing.assert_allclose(actual_tensor, expected_tensor)
  
file_path: GPflow/tests/gpflow/utilities/test_model_utils.py
imports: import numpy
  import pytest
  import tensorflow
  import gpflow
  from gpflow.base import TensorType
  from gpflow.utilities import add_likelihood_noise_cov, add_noise_cov, assert_params_false
label_desc: Use image node_id 3 for calling a global function with example usage: test_add_noise_cov(input_tensor, variance, expected_tensor) without return types